You can, apparently, create a link to a website, but this icon asks you for the address of the site, twice, using different words and doesn't, obviously, allow you to highlight text you have written. from where can be triggered.

Probably blindingly obvious once you know how, but I don't. Any hints gratefully received.

The first entry is the url (web address) of the website, the second is the description you want displayed. You can make both the url or have a custom name. The following two examples point to the same place ....